This movie is one of my all-time favorites and kept me out of any kind of water until I was about 30 years old. (OK, not that long, but it scared living shit out of me when I was kid)

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Actually ...

Shark sighting causes swimming ban at LI beach
WANTAUGH, N.Y. (AP) _ Cue the ominous theme music.
Visitors to Zach’s Bay in Jones Beach State Park were banned from swimming after a shark sighting on Thursday morning.
George Gorman, deputy regional director for the state parks, said the fish was believed to be a thresher shark, about 4 to 6 feet long.
He said the bay had about 20 people there at the time. Authorities surveying the area turned up no signs of the animal, and Gorman said it appeared to have left. The bay is scheduled to be reopened for swimming on Friday morning.
A 5-foot thresher shark washed up on a city beach in September.